"We don't need to have a formal extradition treaty for somebody to be extradited to another country. There are various others means and arrangements in today's days and age.... And it has happened before," Secretary (East) in External Affairs Ministry Anil Wadhwa told reporters here.
Though India and Indonesia signed the extradition treaty in 2011 but Indonesia has not ratified the pact so far.
Wadhwa added that India and Indonesia have to exchange letters ratifying the treaty for the extradition pact to come into force and this is expected to take place during the upcoming visit of Vice President M Hamid Ansari to Indonesia next week.
Asked whether the ministry had sought any report on Rajan's arrest, Wadhwa said this is an issue on which India, Indonesia and Australia are in touch with, and the issue is handled through Interpol.
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"There are no further details which are required at the moment because action is being taken as was anticipated so far," he said, adding if there is a requirement, government would act accordingly.
Rajan was arrested after arriving at Bali's airport from Sydney, based on a red notice from Interpol and following a tip from Australian authorities in Canberra.
In 2000, there was an attempt on his life when Dawood's men tracked him down to a hotel in Bangkok but he managed to escape through the hotel's roof.